You are building SharpDevelop using debugbuild.bat and getting

fatal error C1083: Cannot open include file: 'windows.h': No such file or directory

or

\corprofilercallbackimpl.h(19): fatal error C1083: Cannot open include file: 'cor.h': No such file or directory

?

One possible cause could be that you have more than one Windows SDK installed on your box. Simply start the Windows SDK Configuration Tool, and select 7.0A (that's the version number for Windows 7 SDK with .NET 3.5 SP1 SDK):